Advanced UNIX Programming by Warren W Gay

By Warren W Gay

Complicated UNIX Programming is going past the basics of UNIX programming and offers info and strategies the readers must extend their wisdom base. Designed for pro UNIX programmers, this publication builds at the abilities and information the reader already possesses. It comprises insurance of web methods, interprocess regulate, dossier approach manipulation, synchronization, and lots more and plenty extra.

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The array and the error codes are structured so that the error message can be obtained by using the errno value as the subscript into the array. For example errno = EIO; /* Simulate an error */ printf("The EIO Message is '%s'\n",sys_errlist[errno]); Having access to the error message text for each error code provides much more flexibility. fp ) { /* Did the open fail? \n", sys_errlist[errno], /* The error message text */ pathname); /* The file being opened */ exit(13); } This example shows a typical format for error messages from UNIX programs.

Another way to state this is that if the symbolic link exists, the open call treats this as if the file already exists and returns an error. When opening a file in order to overwrite it, you can specify the O_TRUNC flag. This causes the file to be emptied prior to open(2) returning successfully. Any prior content of the file is lost. 4 Release and cause certain flock(2) semantics to be applied. Chapter 5, "File Locking," will cover the topic of locking files under UNIX. Closing Files Automatically All files are closed when the current process terminates.

See the following FreeBSD example: $ mount /dev/wd0s2a on / (ufs, local, writes: sync 4505 async 92982) /dev/wd0s2e on /usr (ufs, local, writes: sync 6926 async 118585) procfs on /proc (procfs, local) $ ls -l /dev/rwd0s2a crw-r----- 1 root operator 3, 0x00030000 Feb 19 11:05 /dev/rwd0s2a $ The mount(8) command was used to discover the block device names. Note that the ls(1) command adds the letter r to the device name to arrive at the character raw device name of /dev/rwd0s2a for the root mount.

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